US3673445A - Dust seal for electric motors - Google Patents

Dust seal for electric motors Download PDF

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Publication number
US3673445A
US3673445A US99836A US3673445DA US3673445A US 3673445 A US3673445 A US 3673445A US 99836 A US99836 A US 99836A US 3673445D A US3673445D A US 3673445DA US 3673445 A US3673445 A US 3673445A
Authority
US
United States
Prior art keywords
rotor
stator
lip seal
ring
dust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US99836A
Other languages
English (en)
Inventor
Hansrudolf Rutz
Tassilo Schmollinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3673445A publication Critical patent/US3673445A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/3452—Pressing means the pressing force resulting from the action of a spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers

Definitions

  • the seals are constructed in a plurality of parts in order to compensate for axial and radial movements of the rotor.
  • One of the parts is a yieldable ring-shaped lip seal which bears axially against a correspondingly positioned surface on the rotor while the other part, also ringshaped, but non-yieldableand bearing against the surface of the rotor serves to absorb axial thrusts of the rotor and guide the lip seal as well as prevent deformation of the lip seal.
  • the seal structure which prevents ingress of dust and other foreign matter into the air gap between the stator and rotor components of the motor-"includes a stator supported ring-shaped. lip sealmember and a ring-shaped spacer member which bear in an axial direction against a corresponding surface portion of the rotor.
  • the lip seal and spacer members are mounted on an axially movable support ring which is carried by the radially inner ends of a circumferential array of flexible strips whose outer ends are secured to the stator, and compression springs individual to each of the flexible strips exert an axially directed force which is transmitted to the lip seal and spacer members thus to enable the latter to follow any axial movements of the rotor.
  • the spacer member being non-yieldable absorbs axial thrust exerted by the springs and thus prevents the lip seal from being deformed as well as acting as a guide for the seal.
  • the improved multi-part ring seal structure according to the invention assures a 100 percent sealing effect over a very large diameter.
  • the invention also provides a ring-shaped bellows associated with the ring-seal which provides a further sealing effect to prevent ingress of dust into the gap between the stator and rotor, particularly when the motor is shut down, i.e., is at standstill.
  • FIG. 1 illustrates a dust seal of the type already known in the art
  • FIG. 2 is a vertical section through the improved seal structure in accordance with the present invention.
  • FIG. 3 is a sectional view taken along line A-A of FIG. 2.
  • Numeral 1 designates the stator of the motor on which is mounted a radial seal 3 to cover the gap between the stator and the rotor 2 to prevent ingress of dust and other foreign matter.
  • a radial seal is used, for example, in a cement mill in which the grinding drum assumes a greater or lesser angle in operation due to temperature changes and therefore results in a relatively large radial and axial movement of the sealing surface on the rotor, it follows that complete sealing to prevent ingress of dust cannot be ensured.
  • the multi-part ring seal includes a yieldable ring-shaped lip seal 8 and at least one non-yieldable ring-shaped spacer strip 7 (two concentric rings 7 are shown) which bear in an axial direction against a corresponding surface portion of the rotor 2.
  • the lip seal 8 and the two spacer members 7 disposed in concentric radial relation to the axis of the rotor. are secured to an axially movable resiliently mounted support ring 6 which is carried by the inner ends of a circumferential array of flexible strips 9 whose outer ends are secured to the stator.
  • Compression springs 5 individual to the flexible strips 9 exert an axially directed force against the strips which, in turn, is transmitted through the support ring 6 to the lip seal 8 and spacer members 7 thus to enable the latter to follow any axial movement of the rotor without disturbing the seal.
  • the concentric, radially spaced, non-yieldable spacer members 7 absorb axial thrust exerted by the springs 5 as they press against the shaft surface and thus prevent the lip seal 8 from being deformed, as well as acting as a guide for the lip seal.
  • a ring-shaped bellows 4 located radially inward of the flexible strips 9 and their springs 5 functions to prevent ingress of dust and other foreign matter into the gap between stator and rotor, particularly when the motor is shut down, i.e., is at standstill.
  • the ring-shaped seal assembly comprising the ring lip seal 8 and spacer ring members 7 which bears in a resilient manner against the surface of the rotor effects the desired seal and which is satisfactorily maintained even though there be some radial and/or axial displacement of the rotor relative to the stator.
  • the inventive concept is not limited to the actual embodiment which has been illustrated. It is possible, for example, to locate the lip seal 8 radially inward of the ring spacers 7, or between the two ring spacers.
  • a dust seal structure applied in electric motors to prevent ingress of dust and other foreign matter into the air gap between the stator and rotor
  • the combination comprising a yieldable ring-shaped lip seal member and a non-yieldable ring-shaped spacer member which bear in an axial direction against a corresponding surface on the rotor, a support ring on which said lip seal and spacer members are mounted, means for resiliently securing said support ring to said stator, and means including spring means for applying an axially directed force against said support ring and which is correspondingly transmitted to said lip seal and spacer members thereby to enable the latter to follow any axial movement of the rotor, said spacer member serving to absorb the axial thrust applied to said support ring and thereby prevent deformation of said lip seal member.
  • a dust seal structure applied to electric motors to prevent ingress of dust and other foreign matter into the air gap between the stator and rotor
  • the combination comprising a ring-shaped yieldable lip seal member and a ring-shaped non-yieldable spacer member which bear in an axial direction against a corresponding surface on the rotor, said lip seal and spacer members being mounted on an axially movable support ring carried by the radially inner ends of a circumferential array of flexible strips whose outer ends are secured to the sta-

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Sealing Devices (AREA)
US99836A 1970-01-07 1970-12-21 Dust seal for electric motors Expired - Lifetime US3673445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH9570A CH512850A (de) 1970-01-07 1970-01-07 Einrichtung zum Verhindern von Staubeintritt zwischen Rotor und Stator eines Elektromotors

Publications (1)

Publication Number Publication Date
US3673445A true US3673445A (en) 1972-06-27

Family

ID=4179134

Family Applications (1)

Application Number Title Priority Date Filing Date
US99836A Expired - Lifetime US3673445A (en) 1970-01-07 1970-12-21 Dust seal for electric motors

Country Status (7)

Country Link
US (1) US3673445A (de)
CA (1) CA930758A (de)
CH (1) CH512850A (de)
DE (2) DE2016736C3 (de)
FR (1) FR2075193A5 (de)
GB (1) GB1320872A (de)
SE (1) SE381961B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104661845A (zh) * 2012-09-25 2015-05-27 法雷奥电机设备公司 包括电机和两个离合器的传动组件
US9130413B2 (en) 2012-07-25 2015-09-08 Nidec Motor Corporation Electric motor having a partially sealed housing
US20160003362A1 (en) * 2013-05-27 2016-01-07 Eagle Industry Co., Ltd. Mechanical seal device
US20170020015A1 (en) * 2014-02-28 2017-01-19 Johnson Electric Germany GmbH & Co. KG Device comprising a movable component
CN107289135A (zh) * 2017-08-08 2017-10-24 东台市岳东橡胶密封件厂 一种轴向弹性补偿式船用艉轴密封装置
US10205365B2 (en) 2016-03-30 2019-02-12 Milwaukee Electric Tool Corporation Brushless motor for a power tool
WO2023222230A1 (en) * 2022-05-19 2023-11-23 Abb Schweiz Ag Modular sealing system and an electric motor with such a modular sealing system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2103534T3 (es) * 1994-12-09 1997-09-16 Siemens Ag Dispositivo de union estanca entre dos lados frontales de una carcasa.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1750818A (en) * 1926-08-12 1930-03-18 Sauveur Harry Means for preventing leakage
US2522231A (en) * 1945-05-08 1950-09-12 Henrite Products Corp Sealing means for moving shafts

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1750818A (en) * 1926-08-12 1930-03-18 Sauveur Harry Means for preventing leakage
US2522231A (en) * 1945-05-08 1950-09-12 Henrite Products Corp Sealing means for moving shafts

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9130413B2 (en) 2012-07-25 2015-09-08 Nidec Motor Corporation Electric motor having a partially sealed housing
CN104661845A (zh) * 2012-09-25 2015-05-27 法雷奥电机设备公司 包括电机和两个离合器的传动组件
US20160003362A1 (en) * 2013-05-27 2016-01-07 Eagle Industry Co., Ltd. Mechanical seal device
US9400054B2 (en) * 2013-05-27 2016-07-26 Eagle Industry Co., Ltd. Mechanical seal device
US20170020015A1 (en) * 2014-02-28 2017-01-19 Johnson Electric Germany GmbH & Co. KG Device comprising a movable component
US11006537B2 (en) * 2014-02-28 2021-05-11 Martin Koepsell Device comprising a movable component
US20200214160A1 (en) * 2014-02-28 2020-07-02 Martin Koepsell Device comprising a movable component
US10624224B2 (en) * 2014-02-28 2020-04-14 Martin Koepsell Device comprising a movable component
US10432065B2 (en) 2016-03-30 2019-10-01 Milwaukee Electric Tool Corporation Brushless motor for a power tool
US10673305B2 (en) 2016-03-30 2020-06-02 Milwaukee Electric Tool Corporation Brushless motor for a power tool
US10205365B2 (en) 2016-03-30 2019-02-12 Milwaukee Electric Tool Corporation Brushless motor for a power tool
US10931167B2 (en) 2016-03-30 2021-02-23 Milwaukee Electric Tool Corporation Brushless motor for a power tool
US11496022B2 (en) 2016-03-30 2022-11-08 Milwaukee Electric Tool Corporation Brushless motor for a power tool
US12323038B2 (en) 2016-03-30 2025-06-03 Milwaukee Electric Tool Corporation Brushless motor for a power tool
CN107289135B (zh) * 2017-08-08 2019-08-30 东台市岳东橡胶密封件厂 一种轴向弹性补偿式船用艉轴密封装置
CN107289135A (zh) * 2017-08-08 2017-10-24 东台市岳东橡胶密封件厂 一种轴向弹性补偿式船用艉轴密封装置
WO2023222230A1 (en) * 2022-05-19 2023-11-23 Abb Schweiz Ag Modular sealing system and an electric motor with such a modular sealing system

Also Published As

Publication number Publication date
SE381961B (sv) 1975-12-22
DE2016736A1 (de) 1971-07-22
DE2016736C3 (de) 1979-01-18
CA930758A (en) 1973-07-24
CH512850A (de) 1971-09-15
GB1320872A (en) 1973-06-20
FR2075193A5 (de) 1971-10-08
DE2016736B2 (de) 1978-05-11
DE7012794U (de) 1971-11-18

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